mark phillips on a contwo verse net art world. she has that mystic smile, but is this a real mopa lisa? who says crime doesn't pay? jim axelrod on an auction of memorabilia from america's most notorious criminals. >> reporter: this was in clyde's waistband? captioning sponsored by cbs this is the "cbs evening news" with scott pelley. >> pelley: good evening. it turns out the economy is growing even more slowly than we thought. the government told us that u.s. growth in the second quarter was an anemic 1.7%, but today, the commerce department put out a new estimate showing us it was even less than that, just 1.3%. and this is what caught our attention in the report-- the government said half of the downward revision can be blamed on the drought. it's destroying crops, including the corn in this field inula roy, illinois. and on the land clayton arnold has been farming in walker, missouri, for 40 years. a new report today on the drought says it continues to get worse. it now covers 65.5% of the lower 48, and in 21.5% of that area, t